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equipment. Equipment use and control can be altered and the results
monitored to show how energy consumption changes.
The cost of instrumentation is not significant when compared to
overall construction costs and the accuracy should be such as to
provide meaningful readings. The payback from improved energy
performance can be high taking into account the reduction in
electricity consumption and demand charges resulting from more
efficient equipment operation.
For most projects monitoring should include separate meters for
lighting and small power (plug loads and fixed equipment such as an
instantaneous water heater), with additional provisions to monitor air-
conditioning energy use. Where the project includes HVAC&R plant
additional to the core and shell provisions, metering can be more
extensive. For example, a monitoring system should provide the
overall performance of the plant to be determined for all operating
modes and range of operating conditions [
4].
Given the interest in carbon foot-printing and carbon trading, energy
monitoring and targeting is receiving greater attention than hitherto
[5].
4
K Calder. The Building Services Research and Information Association. Practical Chiller System Monitoring.
Technical Note TN 7/94. 1994.
5
Carbon Trust. In-depth management guide CTG008. Monitoring and targeting.